Re: Switching audio via an Ocelot and SECU's

["John W" <Don't_Spam_Me@xxxxxxx>]

I think the operative word in his post is "Power" relays.

Lots of relays are used to switch line-level signals (that's how telephone
switching offices worked AFTER operators with jacks and BEFORE electronic
switching).

The SECU relays are small reed relays intended for applications such as
yours so should work fine?

wrt to the ADI forum - yes, the shortcomings you have identified are real...

John W

"Robert Green" <ROBERT_GREEN1963@xxxxxxxxx> wrote in message
news:VoadneLGZ9zxWX3eRVn-iw@xxxxxxxxxx
> "John W" <Don't_Spam_Me@xxxxxxx> wrote in message
> news:ifmdnaoUWa9gjH3eRVn-vA@xxxxxxxxxxxxxxx
>> Have a look back at that post, I added some info about the relays the
>> SECU
>> uses - not power relays so I don't think that problem will be an issue?
>
> I looked - I'm still not sure of the answer.  Am I missing something or
> can
> you only search the ADI forum ONE topic forum at a time?   Is there
> anything
> I can select, like the View | Current View | Show Replies to My Messages
> in
> Outlook Express, that would show me which posts I have made that need a
> response?  Is there any way to show the last 24 hours of activity rather
> than clicking on "read today's new posts" at 12:01AM and being shown
> nothing, even if there were 1000 posts in the previous 24 hours?  Did I
> mention how much I dislike web fora?  Oy!
>
> Back to the relay question.  I thought JC's commentsimplied the only way
> to
> prevent contact corrosion is to use gold or silver cadmium plated
> contacts:
>
> <<Power relays require a minimum of current through the contacts in order
> to
> stay clean. Switching audio will eventually oxydize the contacts creating
> a
> high resistance path.
>
> Unless the contacts are Gold or bifurcated silver cadmium (yes I know it's
> no longer environmentally safe), the average 10 A contact requires a
> minimum
> of 100Ma at 5V to stay clean.Power relays require a minimum of current
> through the contacts in order to stay clean. Switching audio will
> eventually
> oxydize the contacts creating a high resistance path.>>
>
> I'm going to try posting this question elsewhere after doing a little
> research to make sure I pick the right components for this.  I hate "do
> overs" when a little "pregame" research could have averted the problem.
> This might even be more appropriate for you since you're connecting
> higher-current relays to the SECU to handle more current than they can.
> Hopefully the oxidation problem doesn't affect smaller relays like the
> ones
> in the SECU but I'd hate to have to figure out how to clean them if they
> ever did oxidize.
>
> --
> Bobby G.
>
>
>
>